High-efficiency thread mill with end-cutting edge for non-ferrous metals
AT-2 R-SPEC
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KEY FEATURES: AT-2 R-SPEC Super high-efficiency threading "ThreadRacer"
1 Left-hand cut configuration
Climb milling *Counterclockwise spindle rotation
2 With end-cutting edge
Helical drilling + threading can be done simultaneously
3 Oil hole
Superior chip evacuation (Tool DC = Ø4,6 or more) DLC-IGUSS coating Welding prevention & long tool life
4 Special cutting edge
shape Bending of the tool can be controlled
5 2 Flutes
Wide chip room
6 Roughing teeth (2 ridges)
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Higher efficiency by load distribution
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AT-2 R-SPEC: THREADRACER Threading time can be dramatically reduced! Conventional method (2 processes)
Pre-drilling
AT-2 R-SPEC
Threading
Achieves drilling and threading by continuous helical cutting with a single tool
Rough position settings and inclined nature of cast holes can cause position shifting in following processes...
Comparison of hole position accuracy with drill tap (DRT) 0
DRT
1st hole
DRT
72nd hole
AT-2 R-SPEC
1st hole
AT-2 R-SPEC
100th hole
0,05
0,1
M8×1,25 Depth 18mm AC material Cutting test by shifting the axial center of Ø4,3 pilot hole by 0,7 mm Drill tap: Vc=100m/min,f=1.25mm/rev AT-2 R-SPEC: Vc=220m/min,f=1.2mm/rev
0,15 （mm）
Threading | Thread milling
Useful for preventing shifting of cutting position in cast hole!
s iati o n i ! v e d f o t ed A m o u n a n t l y co n t r o l l c i f si gni
Threading time comparison with conventional method (includes non-cutting time) 0
Conventional method (2 processes) AT-2 R-SPEC
1
2
3
4
4,3 seconds 3,2 seconds
5
(sec.)
M6×1 Threading length 10mm ADC12 material Conventional drill: Vc=126m/min,f=0.6mm/rev Tap: Vc=94m/min (ATC: 1 time) AT-2 R-SPEC: Vc=220m/min,f=1.2mm/rev
e is ing tim Thread y more b reduced ! % than 25
Possible to thread with air-blow!
Q. Cutting oil sometimes cannot be used for machining aircraft and electrical parts... coolant is generally recommended. However, air-blow can also be A. Water-soluble used when a pre-drilled hole is made to enhance chip separation and restrain welding of the DLC coating.
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AT-2 R-SPEC 2D Type DCON
Threading | Thread milling | Metric
Type 1
DC
without Coolant Hole
LU
DCON
LF
with Coolant Hole
First choice in quality and performance
Type 2 DC
Thread milling without pre-drilled hole
LU LF
DLC-IGUSS coating Left-hand (spindle rotation left) Direction of tool feed: right (clockwise) 2 flutes for large chip room. Coolant-through from M6.
N
◉
N
AC,ADC
Threading | Thread milling
Al
◉
M EDP
Minimum Cutting Bore Ø M3 M4 M5 M6 M8 M10 M12
CARBIDE
LH
h6
TP
DC
LF
0,5 0,7 0,8 1 1,25 1,5 1,75
2,4 3,1 4 4,6 6,2 7,5 9
50 50 50 50 70 80 80
Maximum threading length 6 8 10 12 16 20 24
LU
DCON
ZEFP
Type
7,75 10,45 12,8 15,5 20,38 25,25 30,13
6 6 6 6 8 10 10
2 2 2 2 2 2 2
1 1 1 2 2 2 2
LU
DCON
ZEFP
Type
9,25 12,45 15,3 18,5 24,38 30,25 36,13
6 6 6 6 8 10 10
2 2 2 2 2 2 2
1 1 1 2 2 2 2
Metric
8331220 8331221 8331222 8331223 8331224 8331225 8331226
MJ
Price
AT-2 R-SPEC 2,5D Type
Threading | Thread milling | Metric
EDP 8331227 8331228 8331229 8331230 8331231 8331232 8331233
4
Minimum Cutting Bore Ø M3 M4 M5 M6 M8 M10 M12
TP
DC
LF
0,5 0,7 0,8 1 1,25 1,5 1,75
2,4 3,1 4 4,6 6,2 7,5 9
50 50 50 50 70 80 80
Maximum threading length 7,5 10 12,5 15 20 25 30
Price
CUTTING CONDITIONS Threading | Thread milling | Cutting conditions
AT-2 R-SPEC Aluminum Alloy Casting AC4C - ADC Water Soluble
Wrought Aluminum Alloy Magnesium Alloy A5052 - A7075 - AZ91 - AZ80A Water Soluble
Copper Alloy C1100 Water Soluble
100~300m/min
100~300m/min
100~300m/min
Vc
2 X D Type
Type
2,5 X D Type
2 X D Type
2,5 X D Type
2 X D Type
2,5 X D Type
Thread Size
DC
(min -1)
(mm/min.)
(mm/t)
(min -1)
(mm/min.)
(mm/t)
(min -1)
(mm/min.)
(mm/t)
(min -1)
(mm/min.)
(mm/t)
(min -1)
(mm/min.)
(mm/t)
(min -1)
(mm/min.)
(mm/t)
M 3 X 0,5 M 4 X 0,7 M 5 X 0,8 M 6X1 M 8 X 1,25 M 10 X 1,5 M 12 X 1,75
2,4 3,1 4 4,6 6,2 7,5 9
13.263 14.375 15.915 15.224 12.322 10.186 8.488
1.592 1.941 1.910 2.842 2.218 2.037 1.698
0,3 0,3 0,3 0,4 0,4 0,4 0,4
13.263 14.375 12.732 11.072 8.214 6.791 5.659
1.592 1.941 1.528 2.067 1.479 1.358 1.132
0,3 0,3 0,3 0,4 0,4 0,4 0,4
13.263 14.375 15.915 15.224 12.322 10.186 8.488
159 194 255 284 277 255 212
0,03 0,03 0,04 0,04 0,05 0,05 0,05
13.263 14.375 12.732 11.072 8.214 6.791 5.659
159 194 204 207 185 170 141
0,03 0,03 0,04 0,04 0,05 0,05 0,05
13.263 14.375 15.915 15.224 12.322 10.186 8.488
159 194 255 284 277 255 212
0,03 0,03 0,04 0,04 0,05 0,05 0,05
13.263 14.375 12.732 11.072 8.214 6.791 5.659
159 194 204 207 185 170 141
0,03 0,03 0,04 0,04 0,05 0,05 0,05
S
F
fz
S
F
fz
S
F
fz
S
F
fz
S
F
fz
S
F
fz
Note Bottom shape of finished hole is as depicted in the right picture. Please make sure that it is acceptable based on the cutting instruction in advance.
Threading | Thread milling
1. AT-2 R-SPEC is only for milling internal threads. 2. This cutting condition table shows standard values. When machining, it is recommended to use the program created by the NC code generator software ThreadPro. 3. Please select "Single-feed" for the path type in ThreadPro. Please adjust the cutting conditions depending on the rigidity of machine, tool holders, and workpiece clamping. 4. Tool vibrations should be kept at a minimum level for maximum accuracy. 5. When machining magnesium alloy materials, please use the coolant oil recommended by the coolant oil manufacturer. Please also properly dispose the cutting chips to prevent fire hazards. 6. Spindle rotation must be counterclockwise due to the left-hand cut configuration.
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OSG ITALIA Via Ferrero, 65 A/B I - 10098 Rivoli - Italy Tel: +39 0117705211 Fax: +39 0117705215 info@osg-italia.it Vischer & Bolli AG Machining and Workholding Im Schossacher 17 CH-8600 Dübendorf T +41 44 802 15 15 F +41 44 802 15 95 info@vb-tools.com
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06/2021 - All rights reserved. © OSG Europe 2021.
Tool specifications subject to change without notice.
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